Mailbox may refer to:

Letter box (also known as a letter plate, letter hole, deed or mail slot), a private receptacle for incoming mailPost box (also known as a drop box), a public receptacle for outgoing mailPillar box, a freestanding post box in the United Kingdom and the CommonwealthEmail box, a destination for electronic messagesMailbox (application), email management software for mobile devicesMailbox Birmingham, a retail complex in Birmingham, EnglandThe Mailbox (film), a short movie by the Church of Jesus Christ of Latter-day SaintsMessage queue, a means of interprocess communication in software engineeringPigeon-hole messagebox, also known as a cubbyhole, pigeon-hole or pidgea square-centric method of addressing a game board in game playing computer automatons - see Board representation (computer chess)